"Runway visibility was more than 2000 metres and all flight operations were normal," an airport official said.
As many as 200 flights were disrupted and many flights were diverted to other cities due to the fog resulting in low visibility and other operational problems on Jan 2 and Jan 3.
Besides the fog, a cable fault in the runway visual range (RVR) measuring equipment led to closure of Delhi airport's two CAT-III B compliant runways and a halt in operations for over eight hours.
"The Met Department has flown in a new Wi-Fi unit from Pune to replace the faulty unit and efforts were on to set up the system. A new CAT 5 cable to run between the ATC tower and the Met Office was required and would be installed today," Delhi International Aiport Ltd (DIAL) said, adding CAT-III operations was expected to resume on Monday, Jan 4.